Peridot and Petalite Physical Properties

Peridot

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.54-1.552.40

1 7.18

1.5 Fracture

Conchoidal

Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal

1.6 Cleavage

Poor

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

6.5-76-6.5

2 10

1.8 Chemical Composition

(Mg,Fe)₂SiO₄

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Peridot and Petalite Chemical Formula

While comparing Peridot and Petalite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Peridot and Petalite chemical formula.

Chemical formula of Peridot- (Mg,Fe)₂SiO₄
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Semi Precious Gemstones

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Peridot Vs Garnet

Peridot and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Peridot and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Peridot and Petalite Optical Properties during the identification of gemstone. Specific gravity of Peridot is 2.40 whereas that of Petalite is 2.40.